Effects of floral herbivory on foraging behaviour of bumblebees and female reproductive success in Pedicularis gruina (Orobanchaceae)
Effects of floral herbivory on foraging behaviour of bumblebees and female reproductive success in Pedicularis gruina (Orobanchaceae)
复制标题
花草食性对熊蜂觅食行为和马先蒿（列当科）雌性繁殖成功率的影响
DOI：
10.1016/j.flora.2013.08.007
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发表时间：
2013-01-01
期刊：
影响因子：
1.9
通讯作者：
Wang, Qing-Feng
中科院分区：
文献类型：
--
作者：
Liao, Kuo;Gituru, Robert W.;Wang, Qing-Feng
植花动物对花性状的影响可能导致传粉者觅食行为的改变，进而影响植物的繁殖成功。食草植物可能已经进化出补偿食草动物繁殖能力下降的机制。在连续两年的野外实验中，研究了高山草本植物马先蒿（Pedicularis gruina）两个自然种群中，植花动物和传粉媒介对雌性繁殖成功率的相对贡献。实验操作包括套袋、手补、雌雄同体授粉和模拟植花。大黄蜂不仅避免了受损的花和植物，而且减少了花在受损植物上的连续访问，后者可能降低了雌婚的水平。虽然受损植株的单果结实数高于完好植株，但总种子数低于完好植株，这是由于花食草性传粉媒介的限制导致了坐果数的急剧减少。总体而言，研究结果表明，受损植物花序内的资源重新分配可能部分补偿了种子产量的减少。此外，一项新的发现是植物内连续大黄蜂访问在花食草后减少。由于自亲和种表现出近交抑制，这可能会增加黄豆种子的数量和质量。本研究报道的草食补偿模式及其后果为植物的植食和授粉相互作用对植物生殖适宜性的综合影响提供了一个新的视角。(C) 2013爱思唯尔有限公司版权所有。
The effects of floral herbivores on floral traits may result in alterations in pollinator foraging behaviour and subsequently influence plant reproductive success. Fed-upon plants may have evolved mechanisms to compensate for herbivore-related decreased fecundity. We conducted a series of field experiments to determine the relative contribution of floral herbivores and pollinators to female reproductive success in an alpine herb, Pedicularis gruina, in two natural populations over two consecutive years. Experimental manipulations included bagging, hand supplemental, geitonogamous pollination, and simulated floral herbivory. Bumblebees not only avoided damaged flowers and plants but also decreased successive visits of flowers in damaged plants, and the latter may reduce the level of geitonogamy. Although seed set per fruit within damaged plants was higher than that in intact plants, total seed number in damaged plants was less than that in intact plants, since floral herbivory-mediated pollinator limitation led to a sharp reduction of fruit set. Overall, the results suggest that resource reallocation within inflorescences of damaged plants may partially compensate for a reduction in seed production. Additionally, a novel finding was the decrease in successive within-plant bumblebee visits following floral herbivory. This may increase seed quantity and quality of P. gruina since self-compatible species exhibit inbreeding depression. The patterns of compensation of herbivory and its consequences reported in this study give an insight into the combined effects of interactions between floral herbivory and pollination on plant reproductive fitness. (C) 2013 Elsevier GmbH. All rights reserved.